DG400 (3-Phase)

DG400 (3-Phase)

The Cat® spark-ignited lean burn generator for stationary standby, demand response and limited time power (LTP) applications offer reliable power with best in class fuel efficiency, lower footprint and cleaner exhausts. The abilitity to operate even at very low fuel inlet pressures makes it best suited for a range of applications


Emissions Strategy

  • Certified EPA Stationary Emergency
  • Complies with emission standards required for local permits

Cat CG18 Engine

  • Robust high speed block design provides prolonged life and lower owning operationg costs
  • Designed for maximum performance on low pressure pipeline natural gas
  • Leading edge technology in ignition system and air/fuel ratio control for lower emission and engine efficiency
  • One electronic control module handles all engine functions: ignition, governing, air/fuel ratio control and engine protection


  • Class H Insulation. Highest classification ensures alternator durability
    • Matched to the performance and output characteristics of Cat gas engines
    • Industry leading mechanical and electrical design
    • Industry leading motor starting capabilities
    • High Efficiency

EMCP 4.2B Control Panel

  • User-friendly interface and navigation
  • Scalable system to meet a wide range of installation requirement
  • Expansion modules and site-specific programming for specific customer requirements

Cooling System

  • Designed to operate in standard ambient temperatures up to 43°C (110°F)
  • Contact your Cat Dealer for specific ambient and altitude capabilities

Full range of attachments

  • Wide range of bolt-on system expansion attachmentsr
  • Factory designed and tested
  • Flexible packaging options for easy and cost effective installation


  • Compact in-line design allows for improved packaging, resulting in the smallest genset footprint

Standard Equipment

  • Dry exhaust manifolds, insulated and shielded
Fuel System
  • Gas train with Zero Pressure regulator
  • ECU controlled shutdown solenoid
  • Airfuel Ratio Control, Venturi type Air-Gas mixer, throttle controlled valve
  • EMCP 4.2B
  • Integrated Voltage Regulator (IVR)
  • PL444 Product link 4G LTE Telematics
  • Anti-condensation space heater
  • SR5
  • Electronic Governing
  • 24V starting motors
  • Paint - Caterpillar Yellow except rails are gloss black
  • Operation and maintenance manuals
  • Parts book

Additional information

Offering Type

Generator Set Specifications - Frequency

60 Hz

Generator Set Specifications - Emissions/Fuel Strategy

U.S. EPA Certified for Stationary Emergency Application and Non-Emergency Applications

Generator Set Specifications - RPM


Generator Set Specifications - Voltage

208 – 600 VAC

Generator Set Specifications - Natural Gas Rating

400 ekW

Engine Specifications - Engine Model

Cat® CG18 In-line 6, 4-cycle Natural

Engine Specifications - Fuel System

Gas mixer, Venturi

Engine Specifications - Aspiration

Turbocharged – Air-to-Air Aftercooled

Engine Specifications - Governor Type


Engine Specifications - Displacement

18.1 l ( 1106.3 in³ )

Engine Specifications - Compression Ratio


Engine Specifications - Bore

145 mm ( 5.7 in )

Engine Specifications - Stroke

183 mm ( 7.2 in )

Generator Set Dimensions - Length

3581 mm ( 154 in )

Generator Set Dimensions - Width

1854 mm ( 73 in )

Generator Set Dimensions - Height

2083 mm ( 82 in )

Generator Set Dimensions - Weight

4863 kg ( 10721 lb )

Generator Set Specifications - Fuel Type

Natural Gas

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